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In the chiller objects, the "Reference Chilled Water Flow Rate" is not autosized. This can be seen in the "Component Sizing Summary" table output. Look for columns labeled "User-Specified". For chillers, the capacity autosizes based on chilled water flow rate, so the fixed flow rate is also fixing the capacity. If you look at the various alternatives, the "Design Size Reference Chilled Water Flow Rate" is changing.

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